Despite being a lightweight class robot, Mammoth was entered in the Middleweight Championship in Extreme Series 1, because there was no Lightweight Championship for that series, as it was cancelled at the last minute. Mammoth was again entered in the Middleweight Championship in Extreme Series 2, this time because the team accidentally listed the robot as a middleweight and didn't realise their mistake until it was too late to change it.

In Extreme Series 1 it was wedge-shaped and armed with an axe and rear saws, but it looked unstable and was poorly armoured. The legs consisted of two elongated strips of metal, somewhat like a shufflebot. The wedge shape was high off the ground, and a separate wedge was used to give the Mammoth the ability to get under other robots.

In Extreme Series 2, it was four legged, more barrel-shaped and had more potent weapons (a 500mm rear saw and 300mm front cylinder cutter), but again looked unstable. It used a curved design on top, and featured hands and eyes.

Mammoth made its Robot Wars debut in a Walker Battle in the Third Wars, which took place after the first round of Heat M of the main competition. In its Walker battle, Mammoth was placed up against Anarachnid, a walker in the weight class above Mammoth. At the start of the battle, Anarachnid slowly moved across the arena, but Mammoth was unable to walk properly as the legs just flailed around. Eventually, the two robots met and Anarachnid pushed Mammoth towards the arena side wall. House robot Sergeant Bash then came in set Mammoth's hair on fire with its flamethrower and the other house robots came in and attacked both competitor robots for the remainder of the battle. Both robots were just about still active at the end of the battle, when time finally ran out, so the battle went to a judges' decision. The judges' decision resulted in a draw between the two competitors, this would statistically prove to be Team Mammoth's greatest result in Robot Wars history.

"It was a wooly mammoth at one stage, now it's a balding minnow, really."

Extreme 1 was the only time where Ian Burell competed alone, but he made a large stick man to join him in the control pod, to compensate. The Middleweight Championship in the first series of Extreme, was, like the previous ones, a straightforward melee of all of the contestants. In the melee, Mammoth was placed up against Zap of the Beef-Cake team, former champions Hard Cheese, the Edinburgh Air Cadets' Typhoon, Welsh participants Genesis and the first incarnation of Doom. In the battle, Mammoth slowly walked around the arena, trying to get into the action, without meeting any competition for a while. However, Typhoon eventually came in, after immobilising Genesis, and ripped one of Mammoth's legs clean off. The other leg of Mammoth was still working, but it couldn't gain any purchase on the arena floor, so Mammoth couldn't move at all. Typhoon then did more damage to Mammoth's shell, before Mammoth was then pushed away by Doom. Typhoon then lightly bumped into Doom, immobilising the latter too. Meanwhile, Zap, and then Hard Cheese, had both slowly ground to a halt. Genesis was eventually counted out by the Refbot, and was thrown by the arena floor flipper. Mammoth and Zap were then thrown by the arena floor flipper at the same time, and subsequently eliminated from the melee, without being counted out. Mammoth and Zap were quickly followed by both Hard Cheese and Doom, who were also thrown by the flipper (without being counted out by the Refbot), with Doom then sustaining severe damage from Matilda. The result was that Typhoon was the winner of the melee.

Philippa Forrester: "We've always seen you as quite a comedy robot, really...we've never really taken you seriously"

Ian Burrell: "You're quite wise!"

— The pre-first round interview

Mammoth is flipped over by 259

Mammoth and Doom Two, positioned on the flipper

In the Extreme Series 2 Middleweight Championship, Mammoth was drawn up against 259, Doom Too and the Typhoon Twins in the heats. In the battle, Mammoth was almost immediately flipped over after 259 attacked Mammoth side on with its flywheel. Mammoth then took damage from Typhoon Thunder. Mammoth was then counted out by the Refbot, and put on the Arena Floor Flipper by Shunt, Doom Too was then put on the flipper just as it sprang into action sending both robots flying through the air, Shunt was also knocked sideways. Mammoth was righted as it landed, and tried to run away as the team celebrated it being the right way up. However, Mammoth was caught by Dead Metal, and Mammoth was cut into by Dead Metal's saw. Meanwhile, Typhoon Lightning had already been pushed into the pit by 259, and Doom Too had been pushed in as well by Shunt. Mammoth joined those two, as Dead Metal soon pushed it in as well. This was this Mammoth's last appearance on Robot Wars.

The Extreme 2 version of Mammoth was modified to also compete in Robot Wars' sister show Techno Games 2002. It competed in various events, including the Cycling (where it failed to start), the Swimming (where it broke down in the first round) and the Sprint. In the Sprint, after a lot of upsets including winning against future Techno Games sprint champion Bumble after it failed to just cross the finish line due to weak radio transmission, it actually managed to get runner-up, losing out to Team 101's Scuttle.

Of the 14 walkerbots in Robot Wars history, this version of Mammoth was the only lightweight class walkerbot.

In 2015, Stuart Burrell of Team Mammoth was asked if the team ever planned to build a heavyweight robot.

"We did look into it but we could never get the weight class rules in our favour... we were always in the same weight group not one above (paper work issues)... the only time you see us on form was the Featherweight battle... thanks for the kind words﻿"